There isn't much cash in the plate when it goes by me on Sunday; it's mostly envelopes and a few checks. I would be tempted to visit and sit next to where the ushers congregate with the day's take to see if their bounty looked any different to me.
Then, I would look at the disbursements; i.e. the checks drawn on the accounts. Then, I would start asking questions... If necessary, couch your queries about the cash in terms of concern over the physical security of the people who transport the funds.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.